Kingdra was used in the Gym Battle Ash, who sent Pikachu. Kingdra resisted Pikachu's Thunderbolt and hit him with Twister. Pikachu used Thunder, but it also didn't do much damage, since Kingdra was a part Dragon-type Pokémon. Pikachu used Thunderbolt against Kingdra's Hydro Pump, then used Quick Attack, but it did not affect Kingdra much. Per Misty and Brock's advice, Ash swapped Pikachu with Noctowl. Although Noctowl, who evaded Kingdra's attacks, used Confusion, Kingdra simply aimed Hydro Pump at the wall to prevent it from colliding with it. Kingdra used Agility to counter Noctowl's Hypnosis and wounded Noctowl with Hydro Pimp. Right as Noctowl was to get defeated by another Hydro Pump, Clair stopped the match, because Team Rocket stole the Dragon Fang and triggered the alarm.
In the second battle against Clair, Ash sent Snorlax against her Kingdra. Kingdra evaded Snorlax's Hyper Beam with Agility. Kingdra retaliated with Swift, but Snorlax didn't take much damage and retaliated with Body Slam. Kingdra used Agility and dodged the attack and hurt Snorlax with Hydro Pump. Snorlax evaded Hyper Beam by diving in the pool and retaliated with another Body Slam, which caused Kingdra to be pushed out of the pool. Snorlax jumped out of the pool and dodged Hydro Pump attack. However, Kingdra used Swift on Snorlax's face and fired another Hydro Pump. Snorlax dived in the pool to dodge Kingdra's Hyper Beam and defeated it with Ice Punch.